To indent the second line of a paragraph in Google Docs, you can use the "Indentation" settings to set a hanging indent.
Here are the steps:
1. Select the paragraph that you want to indent the second line.
2. Click on the "Format" menu at the top of the screen.
3. Select "Align & indent" from the dropdown menu.
4. Choose "Indentation options" from the options that appear.
5. In the "Indentation" section, use the "Left" and "Right" fields to set the overall indent for the paragraph.
6. In the "Special indent" section, select "Hanging" from the dropdown menu.
7. Use the "By" field to set the amount of space you want for the hanging indent.
8. Click "Apply" to apply the hanging indent to the selected paragraph.
The second line of the paragraph should now be indented in Google Docs. If you want to indent all the lines in the paragraph except the first one, you can also use the "Increase indent" button on the toolbar, or use the "Tab" key to manually indent the lines.